quilltid says:
Whenever you open your game, there should be a red bar at the bottom and you can push the Game Details button like you see in Bubbles post above. Then you can push the "edit" button next to the game title.
To expand on this with an alternate method, if you open the dropdown
Games menu on top of the site, you can click on the cube icon next to the game title, and it will navigate directly to the Game Details page (if you click the title, you'll navigate to the forum of the game instead).